-It also features the same antagonists, trying to regain their former glory and even call out to their old boss.
-You get to see what happened to the land of Kanto and its inhabitants.
-The protagonist of Red and Blue has been training in seclusion since the events of his respective games.

Do you mean possibly a game that sheds some light on what Red did? I think it's better left as a mystery, honestly.

I'd welcome that. If they announce that Black & White 2 had all regions, I would be satisfied with that game. Maybe they allow us to get all legendaries from each region also. It is annoying that I can't catch a Mew or Celebi in SoulSilver & HeartGold.